Help with Dash Harness clarification

[Autonut]

I’m in wiring mode and I have a couple questions on the dash harness that I could use the hives help on.
I have an early Gen 1 (179) with an early RF supplied harness (2010).

1). Dash harness has a F&R signal lead, Flasher lead and hazard lead. I was under the assumption that the
Steering column harness had that covered and these leads could be eliminated. Correct?

2). There also is a Cooling Fan lead that I thought I could eliminate since I was going to wire through the
Radiator sending unit. Correct?

3). Should an electric fuel pump & wiper motor require relays?

Thanks in advance to all for your input. All comments are appreciated.

Jim

[Autonut]

Well I went over the RF hot rod schematic on line and the I did it wiring diagram and got a better understanding of where most of the column wires go But in the dash harness I still have a Low Beam, High beam with a lead for an indicator light & head light dimmer lead and not sure where these wires go. I’m assuming the high beam lead goes to the in dash high beam switch but what about low beam & dimmer? The GM light switch has a harness plug, so prewired. Are these two wires for the cobra with a different light switch? Any help would be greatly appreciated. Thanks.

Jim

[edwardb]

That vintage of RF harness (2010) is about when I started working on these things. And I know there have been multiple revisions to the harness since then. So I can't tell you if these answers are 100% correct since based on the recent ones I've worked on. FWIW:

1. The hot rod connector in the RF harness plugs into the Ididit steering column used on the Hot Rod and Truck. You no longer need the separate turn signal and hazard wires. Not being sure about your harness, I'd be hesitant to remove them until you confirm everything works without them. But isolate the ends because they're live wires.

2. The cooling fan lead powers the cooling fan. Then there are a couple sensor wires that when grounded power the cooling fan through the relay in the RF panel. Those are attached to a sensor typically in the intake but can be elsewhere depending on your setup. At least that's how the current version works.

3. The fuel pump needs a relay. Again -- current version -- it's combined with an inertia switch. The wipers don't need a relay.

[Dgc333]

The RF harness has provisions for the directionals and hazards to be operated by toggle switches on the dash (Roadster) or through the column (33, Pickup). With the 33 you won't be using the wires that have spade connectors on them. BUT, to prevent back feeding and turning on the front directionals when stepping on the brakes there are a couple of wires you need to cut loose from the spade connectors. I don't recall the colors but there is a paragraph covering it in the manual (if it is missing from your Gen 1 manual down load a Gen 2 manual).

There are two wires that will ground the fan relay in the harness to turn on the fan, one that runs down to the bottom of the radiator for when you put the thermal switch in the bottom of the radiator, another one if you are putting the thermal switch in the intake manifold. This is seperate from the sender in the intake that operates the temperature gauge.

There is a relay on the fuse panel to turn on the fuel pump. You will have to add a relay to turn on wipers.

There are three wires that go to a single pole double through switch to switch between high and low beams, there is also a wire used to wire a high beam indicator light you mount in the dash.

[Autonut]

Thank you @Dgc33 & @edwardb for your detailed responses. In regards to the leads with connectors labeled, Rh rear, LH rear, hazard, signal flasher etc., I was building my female harness plug for the I did it male harness plug with these leads. Is that not correct?

I found a diagram by @papa that incorporated a relay for the low/high beam & dimmer leads to a switch on the dash. Can that switch be a single throw switch, since it’s only energizing a relay? And would a 5-amp switch (push button) work for this, since there is no load on the switch except for energizing the relay?

Is there a need for the fan lead, since the fan will be energized by the radiator sensor?

Thank you for your help, I can’t thank you all enough.

Jim